Improved car-spring



EN U {nvanfnr W Geo W. mrmminn;

' use?! to Self and R.'1 e11ey TO ALL WHOM IT MAY CONCERN:

Be it known that I, GEORGE W. McMINN, of Cincinnati, Hamilton county,State of Ohio, have invented Quinn istes ilatent- @ffirt.

GEORGE W. McMlNN, OF CINCINNATI, OHIO, ASSIGNOR TO HIMSELF AND.

ROBERT T. REILEY, OF SAME PLACE.

Letters Patent No. 71,317, dated November 26. 1867.

IMPROVED GAR-SPRING.

dire firhrhme rtfrrret it in flgrscfitrflrrt tgtiiut mm uni-ting part at11 same.

a certain new and useful Improvement in Car-Springs; and I dohcrebydeclare the following to be a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, making partofthis specification.

My invention consists in such construction of steel springs for carsar.d other vehicles, that lcssmctal is required to produce a spring of agiven power than by any other form of construction in use. In theaccent:

panying drawings--' Figure 1 is a perspective view UL a car-springembodying my improvements.

Figure 2 is a detached view of one of the double or folded leaves.

The spring is composed, as shown, of two double or folded leaves ormembers, A B, the metal in each, as shown in figfZ, being folded at ornear its mid-length, to form the eye A or B, the leaves a b a 6 serving,

each for a layer of the spring, making four layers in all. Tents, 0,prevent displacement in the customary stirrups or bolsters. The foldedleaves are shipped into place to form the complete spring, asshown infig. 1;

none of the'customary bands or strips being required to unite the leavestogether. The inner edges of each plate are curved into the form oflips, d d, which, lOCkingWithin the eye of the other member, becomeefl'ectual to hold the parts securely together, without the aidof strapsor bands, which, in the customary forms, add

greatly to the weight of the spring. The end eyes or. loops A B arefound to he of the most signal utility,

adding largely tothe resilient force of the spring, with very slightincrease of the weight thereof. The said loops are also effective, inconjunction with the end lips (I d, to lock the two members of thespring firmly together. I have found by actual experiments, that while aset of four truck-springs, constructed in the best form hitherto used,will weigh from nine hundred to one thousand pounds, a set formed on myplan, as herein described, will weigh but one hundred and eighty pounds,the springs being equal in power and efiiciency.

I claim herein as new, and of my invention 1 Forming a spring of twoplates of metal, each of which is folded to make two'layers of thespring, and

shaped at or near its mid-length and inner end respectively to form theend eyes or loops A B, and lips 01 d i of the spring, as described. andfor the purposes explained.

In testimony of which invention I hereunto set my hand.

GEORGE W. MeMINN.

Witnesses:

Gno. H. KNIGHT, JAMES H. LAYMAN.

